/*
 * Copyright (c) 2010, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "alkes/gfx/HeapVertexBuffer.h"

namespace alkes {

const static VertexTypeTrait s_table[] = {
    {AL_VERTEX_XY|AL_VERTEX_XYZ,    sizeof(Vector3D)},
    {AL_VERTEX_NORMAL,              sizeof(Vector3D)},
    {AL_VERTEX_COLOR,               sizeof(Color)},
    {AL_VERTEX_SPECULAR,            sizeof(Color)},
    {AL_VERTEX_UV1,                 sizeof(Vector2D)},
    {AL_VERTEX_UV2,                 sizeof(Vector2D)},
    {AL_VERTEX_UV3,                 sizeof(Vector2D)},
    {AL_VERTEX_UV4,                 sizeof(Vector2D)},
};

HeapVertexBuffer* HeapVertexBuffer::create(uint32_t vertex_type)
{
    return new HeapVertexBuffer(vertex_type);
}

void HeapVertexBuffer::destroy()
{
    delete this;
}

HeapVertexBuffer::HeapVertexBuffer(uint32_t vertex_type)
: VertexBufferHelper(vertex_type)
, vertex_size_(VertexBufferHelper::getVertexSize(s_table, AL_LENGTH(s_table), vertex_type))
, vertex_count_(0)
{
}

HeapVertexBuffer::~HeapVertexBuffer()
{
}

int32_t HeapVertexBuffer::getVertexCount()
{
    return vertex_count_;
}

void* HeapVertexBuffer::getBuffer(int32_t index, int32_t count)
{
    AL_PRE_COND(0 <= index && 0 < count, 0);

    uint32_t buflen = (index + count) * vertex_size_;

    void* p = buffer_.getBuffer(buflen);

    if (p)
        vertex_count_ = index + count;

    return p ? index * vertex_size_ + (uint8_t*)p : 0;
}

int32_t HeapVertexBuffer::getVertexSize()
{
    return vertex_size_;
}

const VertexTypeTrait* HeapVertexBuffer::getVertexTypeTraits(int32_t& length)
{
    length = AL_LENGTH(s_table);
    return s_table;
}

}
